Shark migration pattern is complex. Many of them are spreading in entire of oceans They are normally live down to lowest point of 2,000 metres (6,600 ft). Usually people believe that sharks do not live in freshwater. But surprisingly, there are few exceptions like the bull shark and the river shark. These two sharks can live both in seawater and freshwater. That is superb amazing….
http://en.wikipedia.org/wiki/River_shark
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